CRYSTAL AND MOLECULAR-STRUCTURE OF DIMERIC [2,2'-(1,2-DIAMINOETHANE)BIS(2-METHYL-3-BUTANONE OXIMATO)]COPPER(II) PERCHLORATE

The crystal structure of dimeric [2,2'-(l,2-diaminoethane)bis(2-methyl-3-butanone oximato)]copper(II) perchlorate, [Cu(EnAO-H)] 2(004)2, has been determined from three-dimensional X-ray data collected with a scintillation counter. The crystals are monoclinic (P21/c) with two dimeric cations per unit cell of dimensions a = 11.441 (2) Å, b = 12.992 (2) Å, c = 12.640 (2) Å, and ²= 110.20 (1)°. The calculated density of 1.584 (1) g/cm3 is in good agreement with the flotation density of 1.57 (1) g/cm3. The structure was solved by direct methods and refined by full-matrix least squares to R(F) = 0.056 using 2121 reflections with Fo2 > 2.0σ(Fo2). The structure consists of discrete perchlorate ions and centrosymmetric dimeric copper complex ions. The copper(II) atom is in a distorted square-pyramidal coordination which is completed by four nitrogen atoms in the base from one ligand while the axial position is occupied by the bridging oxime oxygen atom of the ligand from the other half of the.dimer. The important bond distances are Cu-O = 2.185 (4) Å, average Cu-N(oxime) = 1.941 (3) Å, average Cu-N(amine) = 1.995 (16) Å, and O.O = 2.698 (6) Å for the intramolecular hydrogen bond. © 1979, American Chemical Society. All rights reserved.